Connecting rod

Abstract

A connecting rod of an example in the present disclosure is divided into a rod body and a cap at an oblique division at a large end, the rod body and the cap fastened by bolts. The connecting rod includes a joining plane and first and second restricting parts. The joining plane is a flat joining surface parallel to the division surface of the large end and is formed on at least one of two abutting portions on which the rod body and the cap join. The first and second restricting parts restrict lateral deviations of the rod body in first and second directions with respect to the cap, respectively. The first and second directions are opposite directions. Each of the first and second restricting parts restricts the lateral deviations by a single set of first or second opposing surface provided between the rod body and the cap.

What is claimed is: 
     
       1. A connecting rod which is divided into a rod body and a cap at a large end in an oblique division, the rod body and the cap being fastened by a bolt, the connecting rod comprising:
 an oblique division surface formed at the oblique division at the large end, the oblique division surface including two abutting portions on which the rod body and the cap join; 
 a pair of joining planes parallel to the oblique division surface of the large end; 
 a first restricting part which restricts lateral deviation of the rod body in a first direction with respect to the cap by a single set of first opposing surfaces provided between the rod body and the cap; and 
 a second restraining part which restricts lateral deviation of the rod body in a second direction opposite to the first direction with respect to the cap by a single set of second opposing surfaces provided between the rod body and the cap, wherein 
 the pair of joining planes is formed on surfaces of one of the two abutting portions, 
 the other of the two abutting portions comprises a convex portion formed on one of the rod body and the cap, and a concave portion formed on the other of the rod body and the cap and fitted to the convex portion, 
 one of the first restricting part and the second restricting part comprises a side surface on a first direction side of the convex portion and a side surface on a first direction side of the concave portion, 
 the other of the first restricting part and the second restricting part comprises a side surface on a second direction side of the convex portion and a side surface on a second direction side of the concave portion, and 
 of the two abutting portions, the abutting portion on a side towards which the rod body is inclined with respect to the oblique division surface comprises the convex portion and the concave portion. 
 
     
     
       2. The connecting rod according to  claim 1 , wherein
 the convex portion is formed in a mountain shape comprising a first mountain slope inclined from the top portion of the convex portion toward the first direction and a second mountain slope inclined from the top portion toward the second direction, 
 the concave portion is formed in a valley shape comprising a first valley slope inclined from the bottom of the concave portion toward the first direction and a second valley slope inclined from the bottom toward the second direction, 
 one of the first restricting part and the second restricting part comprises the first mountain slope and the first valley slope, and 
 the other of the first restricting part and the second restricting part comprises the second mountain slope and the second valley slope. 
 
     
     
       3. The connecting rod according to  claim 1 , wherein bolt holes into which the bolt penetrate are formed in the top of the convex portion and the bottom of the concave portion. 
     
     
       4. A connecting rod which is divided into a rod body and a cap at a large end in an oblique division, the rod body and the cap being fastened by a bolt, the connecting rod comprising:
 an oblique division surface formed at the oblique division at the large end, the oblique division surface including two abutting portions on which the rod body and the cap join; 
 a plurality of pairs of joining planes parallel to the oblique division surface of the large end; 
 a first restricting part which restricts lateral deviation of the rod body in a first direction with respect to the cap by a single set of first opposing surfaces provided between the rod body and the cap; and 
 a second restraining part which restricts lateral deviation of the rod body in a second direction opposite to the first direction with respect to the cap by a single set of second opposing surfaces provided between the rod body and the cap, wherein 
 a pair of the plurality of pairs of the joining planes are formed on both surfaces of each of the two abutting portions, respectively, 
 one of the rod body or the cap is provided with a pair of claw portions which sandwich the other of the rod body or the cap from both outer sides of the two abutting portions, 
 one of the first restricting part and the second restricting part comprises a pressing surface of the claw portion on the first direction side of the pair of the claw portions and a pressed surface of the rod body or the cap which is pressed by the pressing surface of the claw portion on the first direction side, 
 the other of the first restricting part and the second restricting part comprises a pressing surface of the claw portion on the second direction side of the pair of claw portions and a pressed surface of the rod body or the cap which is pressed by the pressing surface of the claw portion on the second direction side, and 
 each claw portion comprises a constriction portion which is a portion having lower rigidity than another portion of the claw portion.